PART 1. 
NATURAL OCCURRENCE OF MAJOR PESTS IN RELATION TO :— 
(a) Flora. 
(b) Nature of the soil. 
(¢) Climatic factors—altitude, distribution and amount of 
rainfall, temperature and humidity. 
(See page 179.) 
OCCURRENCE UNDER CONDITIONS OF CULTIVATION :— 
(a) Effect of cultivation and implements. 
(b) Rotations. 
(ec) Size of area under control. 
(See page 179.) 
BoLLwoRrMS : VALUE OF CONTROL BY :— 
(a) Natural enemies. 
(b) Elimination of food plants. 
(¢. Implemental cultivation. 
( Rotations. 
Spraying and dusting. 
Trapping adults. 
(«, Hand-picking or collecting larvee in the field. 
(h) Trap cropping. 
(i) Close season. 
Lire HISTORIES : — 
(a) Active period of insect. 
(b) Alternative food plants. 
(¢) Range of flight of adults 
(See page 174.) 
SupaN BOLLWORM : — 
(a) General history in places where it is not considered of 
major importance. 
(b) Geographical distribution. 
(¢) Wild food plants. 
(See page 177.) 
INFORMATION OF GENERAL INTEREST IN CONNECTION WITH SUCH 
MAJOR PESTS AS PINK BOLLWORM, APION, ETC. 
(See page 176.) 
INTERNAL BOLLROT TRANSMITTED BY STAINERS AND OTHER 
insects. (The Secretary for Agriculture, Union of South 
Africa, asked especially for information on this subject.) 
Value of control by:— 
(a) Natural enemies. 
(b) Elimination of food plants. 
(¢) Trapping. 
(d) Hand-collecting. 
(See page 178.) 
' APHIDS AND JASSIDS: VALUE OF CONTROL BY: 
(a) Natural enemies. 
(b) Plant selection for resistance. 
(¢) Spraying and dusting. 
(d) Cultivation. i 
(See page 180.) 
(All the above items have been raised by the Empire 
Cotton Growing Corporation.) 
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